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- SEWING MAGHINE. No. 274,381. Patented Mar. 20,1883. J ,3 7n. v c Z WITNESSBS & MENTOR:

fiZZXW/OM/ ATTORNEYS.

UNITED STATES PATENT rricn.

CARL VON nnnv, or RUDOLSTADT, Assrenor. T0 TUNKER & son, or

' OARLSRUHE, GERMANY.

SEWING-MACHINE.

srEcrrIcArIoN forming part of Letters Patent No. 274,381, dated March 20, 1883.

Application filed August 26, 1882.

.To all whom it may concern:

Be it known that I, CARL VON Earn, a subject of the Emperor of Germany, and resident at Rudolstadt, Germany, have invented new and useful Improvements in Sewing-Machines, of which the following is a specification.

The object of my invention is to provide a new and improved sewingmachine which makes a double lock-stitch and which sews directly from two spools of thread.

The invention consists in a rotary spoolholder moving in a circular track below the sewing-plate and operated by driving-arms attached to the end of the driving-shaft, which spool-holder is provided with a cage for holding the spool, the said cage being provided with a pivoted frame-bar to permit opening the cage to place a spool therein.

The invention further consists in a verticall y and transversely movable frame surrounding a cam on the drivingshaft, which frame is connected by a slotted lever with a lever carryingthe feeder-teeth, and operates the said lever carrying the feeder-teeth. The fulcrumpivot of the slotted lever can be adjusted and the length of the stitch will be varied according to the adjustment of the said pivot.

The invention also consists in details of construction and combination of parts, as will be fully described and set forth hereinafter.

Reference is to he had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures. 1

Figure 1 is a longitudinal view of the bottom thread or spoolholder of my improved sewingmachine, parts being shown broken out. Fig. 2 is a plan view of the same, parts being shown broken out and in section. Fig. 3 is a crosssectional elevation of the same on the line 3 3 Fig. 1. Fig. 4 is alongitudinal elevationof the same, showing the manner of forming the stitch. Fig. 5 is a cross-sectional elevation on the line w m, Fig. 2, showing the cam. Fig. 6 is a longitudinal sectional elevation of the spoolholder.

A bracket-piece,A, projects downward from the sewing-machine frame below the sewingplate B, and in the said bracket-piece A the shaft 0 is jourhaled. The bracket-piece A is (Model) provided with a series of arms, A, which hold a circular track-frame, D, provided'along its inner edge. with a groove, 0., adaptedto receive the beveled edges b of the spool-holder E. On the shaft G, near one end thereof, a cam-wheel, O, is mounted, which is surrounded by a box, F,provided with two downwardlyprojecting arms, F and F, of which the arm 15 is provided at its lower end with a fork, f, having guide-slots g, into which a rod, h, passes, which projects from an arm, 9', of the ring-frame D, so that when the cam-wheel U rotates it moves the box F backward and forward,and the box and its arms will be guided by the forked prongsf on the lower end of the arm F The other arm, F, is pivoted to the lower end of a longitudinally-slotted lever, G, which is held by an adjustable pivot, H, to a longitudinally-slotted downwardly-projecting arm,J, of the ring D. The pivotH is movably connected by a slot (seen in dotted lines in Fig. 1) to a lever, K, which is pivoted to the ring D, and permits of moving the pivot II higher or lower, as maybe desired, thepivotbeing held at the point of adjustment by screwing it tightly in place, it being provided with a screw-threaded portion entering a female screw-threaded portion. The upper end of the lever G is pivoted to a guided lever, L, to which the feeder-teeth l are attached. At the end of the lever L opposite the one pivoted to the lever G the said lever L is provided with a longitudinal slot, into which a pin, Z, in the frame D passes, so that the said lever L will have a reciprocating and a rocking motion. The feeder-teeth Z are operated by theleverL, which in turn is operated by the slotted lever G. If the pivot H is moved down to the lower part of the slotted lever G, the reciprocating movement of the teeth will be long, and long stitches will be formed, and if the pivot H is raised the length of the stitches will be decreased correspondingly.

The spool holder E is placed within the ring-frame D, the beveled edges 11 of the spool holder passing into the beveled grooved edges to of the ring-frame D. Two arms, M, the ends of which are curved, project from the end of the shaft 0 into the ring-frame D, and serve to turn the spooi -holder around in the said frame. The spool-holder E consists of a semicircular plate, which is provided at one end with a curved beveled point or nose, m. Part of the semicircular plate or disk forming the spool-holder is cut out to form a recess for the spool, and the rods n, which are formed by cutting out the plate, form a cage for receiving the spool O. The ends of the cage are beveled, and thereby a beveled head, 0, will be formed near the point m of the spool-holder. One of the bars pot the cage for receiving the spool is pivoted to the head 0, and at its opposite end is provided with a hook, g, which passes through an aperture, 1', in the plate of the spool-holder. The said pivoted cage-bar 10 is provided with two curved side arms,-p, which complete the cage. ()onical blocks P are placed in the ends of the spool O, and a spindle, Q, is passed through the said blocks and through. the spool. One end of the said spindle Q is passed into a spring-socket, R, and the other is passed into a fixed socket, B, so that the spool can easily be removed by pressing the spring-socket R inward and withdrawing the opposite end from thefixed socket. The thread passes from the spool through the slot 13 in the spool holding disk, and then through apertures in the pivoted cage-bar p, and then through the plate B.

The-operation is as follows As soon as the thread has formed a loop by the upward movement of the needle, the point m of the thread or spool holder E enters the said loop, and in turning in the direction of the arrow at the loop lays itself on both sides of the round head 0, and is opened wide enough for the thread.- holding cage to pass through. At this moment the thread is drawn taut, and the threadholder must be slightly raised by the thread in order that the thread may pass between the driving-arm M and the spool-holderE. The thread is still further drawn upon and the loop arrives at the second drivin g-arm, M, which it passes in the same manner. The loop havingnow passed the spool-holder, the thread of the latter will be within the loop, which can now be drawn up. The cam G acts upon the box F, carrying the arms F F one of which moves the lever G, which in turn rocks and reciprocates the feeder-lever L, moving the feeding-teeth Z to carry the work along. The thread is drawn taut by the spool-holder pressing it out of the straight line with the stitchplate. The knotting of the thread is the same as in the ordinary shuttle-machine, the rest of the mechanism being the same as that in general use at present.

Having thus described in yin vention, what I claim as new, and desire to secure by Letters Patent, is

1. In a sewing-machine, aspool-holder which runs in a circular guide or track and is at the same time the rotating thread-carrying hook, said spool-holder being driven by two side arms, and consisting of a flat segmentof a circle and of a skeleton holder having curved side strips or arms to effect the unobstructed passage of the spool and spool-holder through the loop of the upper thread, one of said strips being provided with'a hinge and catch to permit it to be swun g back for the removal or replace ment of a spool, substantially as and for the purpose set forth.

2. In a sewing-machine, the flat segmental spool-holder provided with the thread-carrying hook and running in a circular grooved track, said spool-holder having the segmental thread-slott in its flat portion and the series oLtriangularly-arrauged thread-apertures in one of the strips of its skeleton portion, as shown and described, and for the purpose set forth. v

3. In a sewing-machine, the-combination, with the shaft provided with a cam, of a box surrounding said cam and provided with arms, of which one is guided to reciprocate the box and arms, the other being connected by means of a lever with a rocking and sliding bar carrying the cloth-feeder teeth, substantially as and for the purpose set forth.

4. In a sewing-machine, the combination, with the shaft 0, provided with a cam, O, of the box F, provided with the arms F F, the lever G, the arm J, the pivot H, the lever L, pivoted to the lever G and carrying the feeder-teeth Z, substantially as and for the purpose set forth. a

5. In a sewing-machine, the combination with a shaft provided with a cam-wheel, of a ciprocate the box and the arms, the other he ing connected by means of a pivoted lever, the oscillation of which can be adjusted, with a rocking and sliding bar to which the clothfeeder teeth are attached, substantially as herein shown and described, and for the purpose set forth. 7

6. In a sewing-machine, the combination, with the shaft .0, provided with a cam, O, of the box v13, provided with the arms F and F the slotted lever G, the slotted arm J, the an justable pivot H, the lever L,pivoted at the other end of the lever G, and the feeder-teeth l, attached tothelever L, substantially as here-' in shown and described, and for the purpose set forth.

7. In a sewing-machine, the combination, with the shaft 0, provided with the cam O, of the box F, provided with the arms F and F the fork f, formed at the lower end of the arm F, the rod h, the slotted lever G, pivoted to the end of the arm F, the slotted arm J, the

adjustable pivot H. the rocking and recipro- 

